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Air Con and Heater Fan Intermittent


lead7

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Hey everyone! I'm new here. I have a 2008 350Z.

 

Here is the problem: When talking about the air conditioning/heating. Whether the fan is selected to be on high or on auto, it does not blow as it should. About once a minute I hear the fan try to spool up but it never makes it to full speed (or even half) before it stops entirely. As far as I can tell, it seems like the temperature of the air that comes out of vents is appropriate to the setting.

 

This Summer, the blower motor broke (it was a hardware problem where it was making a ton of noise when running). I replaced the blower motor this Summer and everything worked great for a while. Now it's doing this. When I hear it try to spool up nothing sounds strange or broken other than it doesn't blow, as discussed above.

 

Any suggestions about things to try or what may be wrong? Its cold here now and it will be really hot soon.

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  • 1 month later...

Well, I got it fixed. Here's what it was.

 

It turns out the blower motor resistor was not working. The resistor, is located inside the blower motor and is part of the same assembly. This means you need to replace the whole blower motor. So I replaced the whole blower motor again. (Lifetime warranty because I had already replaced the original for a different reason.) 3 screws and a plug later the problem was fixed.

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